3 results about "Pyridine synthesis" patented technology

The invention discloses a preparation method of a flaky ZSM-5 molecular sieve and application of the flaky ZSM-5 molecular sieve in pyridine synthesis reaction, and belongs to the technical field of molecular sieve preparation and catalytic application. Comprising the following steps: adding a silicon source, an aluminum source, a template agent and a regulator into all-silicon ZSM-5 molecular sieve crystallization mother liquor, and fully stirring to form gel; and carrying out dynamic crystallization on the gel, cooling, carrying out suction filtration on the product, washing to be neutral, drying to obtain flaky ZSM-5 molecular sieve raw powder, and roasting the raw powder to remove the template agent to obtain the flaky ZSM-5 molecular sieve. The molecular sieve is sprayed and then applied to a pyridine synthesis reaction through aldehyde ammonia condensation, and the pyridine yield and the catalyst stability can be remarkably improved. The ZSM-5 molecular sieve with a smaller particle size is synthesized by recycling the all-silicon ZSM-5 molecular sieve mother liquor, so that efficient cyclic utilization of resources is realized, the use amount of a template agent is reduced, the influence of waste discharge on the environment is reduced, the catalytic performance is excellent, and the method has important economic and environment-friendly values.

The utility model belongs to the technical field of DCTF crude product treatment, and discloses a standing layering kettle for crude product treatment in the synthesis process of 2, 3-dichloro-5-trifluoromethylpyridine, which comprises a kettle body, one side of the top end of the kettle body is provided with a feeding pipeline, the bottom end of the kettle body is provided with a slag discharging port, one side of the bottom end of the kettle body is provided with a discharging port, and the other side of the bottom end of the kettle body is provided with a discharging port. A plurality of through holes are formed in the surfaces of the partition plates in a penetrating manner, a cover plate is mounted at the top end of the kettle body through a flange, a central rotating shaft is rotationally mounted at the bottom end of the cover plate through a bearing seat, a plurality of stirring plates are mounted on one side of the central rotating shaft, and the bottom end of each stirring plate clings to the top end of each partition plate. According to the device, a crude product can be layered in the kettle body, the standing time is shortened, uniform distribution of materials is ensured through the central rotating shaft, the stirring plate and the cover plate, the phenomena of precipitation and agglomeration are avoided, layering is more thorough, the production efficiency is further improved, and the stability of the layering kettle is improved.